Add Creative Commons license

Add a simplified (human-readable) version of the Attribution-ShareAlike
4.0 International (CC BY-SA 4.0)

https://creativecommons.org/licenses/by-sa/4.0/
Add jekyll blog skeleton

Add github hack template skeleton for the blog
Add basic layouts for index and post pages
Remove unused downloads section
Fix link colors

Remove text-decoration from home link and change all header links to be
displayed with the same color as the headers themselves.
Extract post excerpts into partial

Move post excerpts into their own partial for better organization and
cleaner templates.
Add 'Vim Most Used Commands'

Lately at work we've been using a combination of vim/tmux to make pair
programming a lot easier.  This is especially helpful when working
remotely or under a crappy internet connection, as you won't need high
bandwidth.